--- a/docs/concepts.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/concepts.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -92,8 +92,8 @@
 think of the traditional parent/child DAG as the first derivative of
 your source code, and the obsolescence DAG as the second derivative.)
 
-Troubled changesets (unstable, bumped, divergent)
--------------------------------------------------
+Troubled changesets (orphan, bumped, divergent)
+-----------------------------------------------
 
 Evolving history can introduce problems that need to be solved. For
 example, if you prune a changeset *P* but not its descendants, those
@@ -102,7 +102,7 @@
 at the same time. But Mercurial does not push obsolete changesets like
 *P*, so it cannot push the descendants of *P*. Any non-obsolete
 changeset that is a descendant of an obsolete changeset is said to be
-*unstable*.
+an *orphan*.
 
   [diagram: obsolete cset with non-obsolete descendant]
 
@@ -132,13 +132,13 @@
 successors are both called *divergent* (unless one of them is in
 public phase; only mutable changesets are divergent).
 
-The collective term for unstable, bumped, and divergent changeset is
+The collective term for orphan, bumped, and divergent changeset is
 *troubled*::
 
-  troubled = unstable ∪ bumped ∪ divergent
+  troubled = orphan ∪ bumped ∪ divergent
 
 It is possible for a changeset to be in any of the troubled categories
-at the same time: it might be unstable and divergent, or bumped and
+at the same time: it might be an orphan and divergent, or bumped and
 divergent, or whatever.
 
   [diagram: Venn diagram of troubled changesets, showing overlap]

--- a/docs/evolve-faq.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/evolve-faq.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -144,7 +144,7 @@
 ---------------------------------------
 
 When you rewrite (amend) a changeset with children without rewriting
-those children you create *unstable* changesets and *suspended
+those children you create *orphan* changesets and *suspended
 obsolete* changesets.
 
 When you are finished amending a given changeset, you will want to

--- a/docs/figures/figure-ug06.svg	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/figures/figure-ug06.svg	Sat Apr 27 21:24:18 2019 -0400
@@ -737,7 +737,7 @@
        id="tspan4456"
        x="150.66776"
        y="148.39902"
-       style="font-size:10px;line-height:1.25;font-family:sans-serif">unstable</tspan></text>
+       style="font-size:10px;line-height:1.25;font-family:sans-serif">orphan</tspan></text>
   <path
      style="color:#000000;fill:none;stroke:#707070;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker:none;marker-end:url(#marker3230);visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
      d="m 41.433633,155.93241 c 4.445697,11.92656 24.017716,1.13391 25.948336,14.64825"

--- a/docs/figures/figure-ug08.svg	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/figures/figure-ug08.svg	Sat Apr 27 21:24:18 2019 -0400
@@ -380,7 +380,7 @@
          id="tspan9303"
          x="125.75282"
          y="939.66284"
-         style="font-size:10px;line-height:1.25;font-family:sans-serif">unstable</tspan></text>
+         style="font-size:10px;line-height:1.25;font-family:sans-serif">orphan</tspan></text>
     <text
        xml:space="preserve"
        style="font-style:italic;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:0%;font-family:sans-serif;-inkscape-font-specification:'Sans Italic';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none"

--- a/docs/figures/figure-ug10.svg	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/figures/figure-ug10.svg	Sat Apr 27 21:24:18 2019 -0400
@@ -446,7 +446,7 @@
          id="tspan9303"
          x="155.24913"
          y="668.43335"
-         style="font-size:10px;line-height:1.25;font-family:sans-serif">unstable</tspan></text>
+         style="font-size:10px;line-height:1.25;font-family:sans-serif">orphan</tspan></text>
     <g
        id="g5433"
        transform="translate(32.476727,584.47248)">

--- a/docs/figures/figure-ug11.svg	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/figures/figure-ug11.svg	Sat Apr 27 21:24:18 2019 -0400
@@ -488,7 +488,7 @@
          id="tspan9303"
          x="159.24913"
          y="668.43335"
-         style="font-size:10px;line-height:1.25;font-family:sans-serif">unstable</tspan></text>
+         style="font-size:10px;line-height:1.25;font-family:sans-serif">orphan</tspan></text>
     <text
        xml:space="preserve"
        style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:0%;font-family:monospace;-inkscape-font-specification:Monospace;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none"

--- a/docs/from-mq.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/from-mq.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -115,10 +115,10 @@
 ````````
 
 When you rewrite changesets, descendants of rewritten changesets are marked as
-"unstable". You need to rewrite them on top of the new version of their
+"orphan". You need to rewrite them on top of the new version of their
 ancestor.
 
-The evolution extension adds a command to rewrite "unstable"
+The evolution extension adds a command to rewrite "orphan"
 changesets:::
 
   $ hg evolve

--- a/docs/obs-terms.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/obs-terms.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -92,9 +92,9 @@
 |                     |                          |                             |
 |                     +--------------------------+-----------------------------+
 |                     |                          |                             |
-|                     | **troubled**             | **unstable**                |
+|                     | **troubled**             | **orphan**                  |
 |                     |                          |                             |
-|                     | *troubled*    has        | *unstable* is a changeset   |
+|                     | *troubled*    has        | *orphan* is a changeset     |
 |                     | unresolved issue caused  | with obsolete ancestors.    |
 |                     | by *obsolete* relations. |                             |
 |                     |                          |                             |
@@ -105,7 +105,7 @@
 |                     | changeset to combine     | (possible alternative name: |
 |                     | multiple issue at once.  | precarious)                 |
 |                     | (a.k.a. divergent   and  |                             |
-|                     | unstable)                +-----------------------------+
+|                     | orphan)                  +-----------------------------+
 |                     |                          |                             |
 |                     | (possible alternative    | **bumped**                  |
 |                     | names: unsettled,        |                             |
@@ -226,7 +226,7 @@
 ``````
 
 Automatically resolve *troublesome* changesets
-(*unstable*, *bumped* and *divergent*)
+(*orphan*, *bumped* and *divergent*)
 
 This is an important name as hg pull/push will suggest it the same way it
 suggest merging when you add heads.

--- a/docs/sharing.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/sharing.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -508,7 +508,7 @@
 but every competent chef keeps several around. Ever try to chop onions
 with a spoon?)
 
-In the user guide, we saw examples of *unstable* changesets, which are
+In the user guide, we saw examples of *orphan* changesets, which are
 the most common type of troubled changeset. (Recall that a
 non-obsolete changeset with obsolete ancestors is an orphan.)
 

--- a/docs/tutorial/draft.md	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/tutorial/draft.md	Sat Apr 27 21:24:18 2019 -0400
@@ -527,7 +527,7 @@
     }
 ~~~
 
-## Unstable
+## Orphan
 
 ~~~graphviz
     digraph G {
@@ -538,14 +538,14 @@
         node[group=main];
         Root -> New;
         node[group=obsolete];
-        Root -> Obsolete -> Unstable;
+        Root -> Obsolete -> Orphan;
 
         // Obsolescence links
         edge[dir=back, style=dotted, arrowtail=dot];
         Obsolete -> New;
 
         Obsolete [fillcolor="#DFDFFF"];
-        Unstable [fillcolor="#FF3535"];
+        Orphan [fillcolor="#FF3535"];
         Root[shape="circle"];
     }
 ~~~

--- a/docs/tutorial/slides.md	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/tutorial/slides.md	Sat Apr 27 21:24:18 2019 -0400
@@ -852,7 +852,7 @@
 output/edit-mid-stack.log
 ```
 
-The message `1 new orphan changesets` means that, by amending a changeset having a child, this child is now **unstable**, as we can see with the `hg stack` command:
+The message `1 new orphan changesets` means that, by amending a changeset having a child, this child is now **orphan**, as we can see with the `hg stack` command:
 
 ```raw-file
 output/edit-mid-stack-after-stack.log
@@ -909,7 +909,7 @@
 output/basic-stabilize-before-log-obsolete.log
 ```
 
-A changeset can also be **unstable**, meaning that it could be subject to one or more **instabilities**:
+A changeset can also be **orphan**, meaning that it could be subject to one or more **instabilities**:
 
 * **orphan**, a changeset whose an ancestor is **obsolete**.
 * **content-divergent**, a changeset which has been rewritten in two different versions.
@@ -1501,7 +1501,7 @@
 $> hg update --rev t1
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 $> hg commit --amend -m "Step1"
-<span style="color:gold;">3 new unstable changesets</span>
+<span style="color:gold;">3 new orphan changesets</span>
 </pre>
 
 #### What have we done?
@@ -1510,11 +1510,11 @@
 $> hg log -G -T compact
 @  <span style="color:olive;">9</span>[tip]     1aa1be5ada40    Step1
 |
-| o  <span style="color:olive;">8</span>        cf90b2de7e65    Step4 <span style="color:red;">(unstable)</span>
+| o  <span style="color:olive;">8</span>        cf90b2de7e65    Step4 <span style="color:red;">(orphan)</span>
 | |
-| o  <span style="color:olive;">7</span>        e208d4205c8e    Step3 <span style="color:red;">(unstable)</span>
+| o  <span style="color:olive;">7</span>        e208d4205c8e    Step3 <span style="color:red;">(orphan)</span>
 | |
-| o  <span style="color:olive;">6</span>        673ff300cf3a    Step2 <span style="color:red;">(unstable)</span>
+| o  <span style="color:olive;">6</span>        673ff300cf3a    Step2 <span style="color:red;">(orphan)</span>
 | |
 | <span style="color:grey;">x  5        8bb88a31dd28    Step</span>
 |/
@@ -1528,9 +1528,9 @@
 $> hg stack
 ###### topic: <span style="color:green;">myfeature</span>
 ###### branch: feature
-<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (unstable)</span>
-<span style="color:olive;">t3</span><span style="color:red;">$</span> Step3<span style="color:red;"> (unstable)</span>
-<span style="color:olive;">t2</span><span style="color:red;">$</span> Step2<span style="color:red;"> (unstable)</span>
+<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (orphan)</span>
+<span style="color:olive;">t3</span><span style="color:red;">$</span> Step3<span style="color:red;"> (orphan)</span>
+<span style="color:olive;">t2</span><span style="color:red;">$</span> Step2<span style="color:red;"> (orphan)</span>
 <span style="color:teal;">t1</span><span style="color:teal;font-weight:bold;">@</span> <span style="color:teal;">Step1</span><span style="color:teal;font-weight:bold;"> (current)</span>
 <span style="color:grey;">t0^ Trunk</span>
 </pre>
@@ -1545,8 +1545,8 @@
 $> hg stack
 ###### topic: <span style="color:green;">myfeature</span>
 ###### branch: feature
-<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (unstable)</span>
-<span style="color:olive;">t3</span><span style="color:red;">$</span> Step3<span style="color:red;"> (unstable)</span>
+<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (orphan)</span>
+<span style="color:olive;">t3</span><span style="color:red;">$</span> Step3<span style="color:red;"> (orphan)</span>
 <span style="color:teal;">t2</span><span style="color:teal;font-weight:bold;">@</span> <span style="color:teal;">Step2</span><span style="color:teal;font-weight:bold;"> (current)</span>
 <span style="color:olive;">t1</span><span style="color:green;">:</span> Step1
 <span style="color:grey;">t0^ Trunk</span>
@@ -1566,7 +1566,7 @@
 $> hg stack
 ###### topic: <span style="color:green;">myfeature</span>
 ###### branch: feature
-<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (unstable)</span>
+<span style="color:olive;">t4</span><span style="color:red;">$</span> Step4<span style="color:red;"> (orphan)</span>
 <span style="color:teal;">t3</span><span style="color:teal;font-weight:bold;">@</span> <span style="color:teal;">Step3</span><span style="color:teal;font-weight:bold;"> (current)</span>
 <span style="color:olive;">t2</span><span style="color:green;">:</span> Step2
 <span style="color:olive;">t1</span><span style="color:green;">:</span> Step1
@@ -1838,13 +1838,13 @@
 
 <pre>
 $> hg summary
-<span style="color:olive;">parent: 10:890ac95deb83 </span>tip (unstable)
+<span style="color:olive;">parent: 10:890ac95deb83 </span>tip (orphan)
  Head
 branch: feature
 commit: (clean)
 update: (current)
 phases: 9 draft
-unstable: <span style="color:red;">1 changesets</span>
+orphan: <span style="color:red;">1 changesets</span>
 topic:  <span style="color:green;">myfeature</span>
 </pre>
 
@@ -1864,7 +1864,7 @@
    packaging
    prev-next
    split
-   stack_unstable_bug
+   stack_orphan_bug
    tutorial
  * tutorialtypos
 </pre>
@@ -1883,7 +1883,7 @@
    obscache               (2 months ago)
    evolvecolor            (2 months ago)
    obsrangecacheiterative (2 months ago)
-   stack_unstable_bug     (2 months ago)
+   stack_orphan_bug     (2 months ago)
    doc                    (3 months ago)
    split                  (3 months ago)
    import-checker         (4 months ago)
@@ -1906,7 +1906,7 @@
    packaging              (on branch: default, 1 changesets, <span style="color:teal;">2521 behind</span>)
    prev-next              (on branch: default, 4 changesets, <span style="color:teal;">72 behind</span>)
    split                  (on branch: default, 1 changesets, <span style="color:teal;">492 behind</span>)
-   stack_unstable_bug     (on branch: default, 1 changesets, <span style="color:teal;">474 behind</span>)
+   stack_orphan_bug     (on branch: default, 1 changesets, <span style="color:teal;">474 behind</span>)
    tutorial               (on branch: default, 2 changesets, <span style="color:teal;">492 behind</span>)
 <span style="color:green;"> * </span><span style="color:green;">tutorialtypos         </span> (on branch: default, 3 changesets, <span style="color:red;">1 troubled</span>, <span style="color:olive;">2 heads</span>, <span style="color:teal;">2 behind</span>)
 </pre>
@@ -1919,7 +1919,7 @@
 |
 o  23abfc79b7ce
 |
-| o  4302274177b9 <span style="color:red;">(unstable)</span>
+| o  4302274177b9 <span style="color:red;">(orphan)</span>
 | |
 | <span style="color:grey;">x  fba593aaaa10</span>
 |/   rewritten as c55cb2ee8a91;
@@ -1931,10 +1931,10 @@
 <pre>
 $> hg evolve --list
 <span style="color:gold;">9ac0d376e01c</span>: changelog: introduce a 'tiprev' method
-  <span style="color:red;">unstable</span>: <span style="color:grey;">52ec3072fe46</span> (obsolete parent)
+  <span style="color:red;">orphan</span>: <span style="color:grey;">52ec3072fe46</span> (obsolete parent)
 
 <span style="color:gold;">3efd3eab9860</span>: changelog: use 'tiprev()' in 'tip()'
-  <span style="color:red;">unstable</span>: <span style="color:red;">9ac0d376e01c</span> (unstable parent)
+  <span style="color:red;">orphan</span>: <span style="color:red;">9ac0d376e01c</span> (orphan parent)
 </pre>
 
 (see also `hg evolve --list --rev`)
@@ -2033,7 +2033,7 @@
 
 * Hide **most** of the complexity
 
-* Help with unstable situations
+* Help with orphan situations
 
     - Automatic detection
 
@@ -2116,7 +2116,7 @@
     }
 ~~~
 
-#### Unstable
+#### Orphan
 
 Now called `orphan`
 
@@ -2129,14 +2129,14 @@
         node[group=main];
         Root -> New;
         node[group=obsolete];
-        Root -> Obsolete -> Unstable;
+        Root -> Obsolete -> Orphan;
 
         // Obsolescence links
         edge[dir=back, style=dotted, arrowtail=dot];
         Obsolete -> New;
 
         Obsolete [fillcolor="#DFDFFF"];
-        Unstable [fillcolor="#FF3535"];
+        Orphan [fillcolor="#FF3535"];
         Root[shape="circle"];
     }
 ~~~

--- a/docs/tutorial/test-training.t	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/tutorial/test-training.t	Sat Apr 27 21:24:18 2019 -0400
@@ -2455,7 +2455,7 @@
 
   $ html_output $TESTDIR/output/edit-mid-stack-after-stack.log stack
   ### target: build/linuxsupport-v2 (branch)
-  <span style="color:olive;">b3</span><span style="color:red;">$</span> Third commit on build/linuxsupport-v2<span style="color:red;"> (unstable)</span>
+  <span style="color:olive;">b3</span><span style="color:red;">$</span> Third commit on build/linuxsupport-v2<span style="color:red;"> (orphan)</span>
   <span style="color:teal;">b2</span><span style="color:teal;font-weight:bold;">@</span> <span style="color:teal;">Second commit on build/linuxsupport-v2</span><span style="color:teal;font-weight:bold;"> (current)</span>
   <span style="color:olive;">b1</span><span style="color:green;">:</span> First commit on build/linuxsupport-v2
   b0^ New commit on build/v2 (base)
@@ -2579,7 +2579,7 @@
 
   $ html_output $TESTDIR/output/basic-stabilize-before-evolve-list.log evolve --list
   3d2c8a2356a2: Third commit on build/linuxsupport-v2
-    unstable: 4686378320d7 (obsolete parent)
+    orphan: 4686378320d7 (obsolete parent)
   
   $ html_output $TESTDIR/output/basic-stabilize-next-evolve.log next --evolve
   move:[<span style="color:blue;">20</span>] Third commit on build/linuxsupport-v2

--- a/docs/user-guide.rst	Sat Apr 27 21:09:47 2019 -0400
+++ b/docs/user-guide.rst	Sat Apr 27 21:24:18 2019 -0400
@@ -336,7 +336,7 @@
 So far, every obsolete changeset we have seen is also hidden. However,
 these are *not* the same thing—that's why they have different names.
 It's entirely possible to have obsolete changesets that are not
-hidden. We'll see examples of that soon, when we create *unstable*
+hidden. We'll see examples of that soon, when we create *orphan*
 changesets.
 
 Note that all hidden changesets are obsolete: hidden is a subset of
@@ -349,10 +349,10 @@
 
 Now that you've got a solid understanding of how ``evolve`` works in
 concert with changeset obsolescence, let's explore some more advanced
-scenarios. All of these scenarios will involve *unstable* changesets,
+scenarios. All of these scenarios will involve *orphan* changesets,
 which is an unavoidable consequence of obsolescence. What really sets
 ``evolve`` apart from other history modification mechanisms is the
-fact that it recognizes instability like unstable changesets and provides
+fact that it recognizes instability like orphan changesets and provides
 a consistent way for you to get back to a stable repository.
 
 (Incidentally, there are two other types of instability that changesets
@@ -393,17 +393,17 @@
   $ hg amend
 
 At this point, revision 11 is *obsolete* and revisions 12 and 13—the
-descendants of 11—are in a funny state: they are *unstable*.
+descendants of 11—are in a funny state: they are *orphan*.
 
 .. figure:: figures/figure-ug06.svg
 
    Figure 6: amending a changeset with descendants means the amended
    changeset is obsolete but remains visible; its non-obsolete
-   descendants are *unstable*. The temporary amend commit, revision
+   descendants are *orphan*. The temporary amend commit, revision
    14, is hidden because it has no non-obsolete descendants.
 
 All non-obsolete descendants of an obsolete changeset are considered
-unstable. An interesting consequence of this is that revision 11 is
+orphans. An interesting consequence of this is that revision 11 is
 still visible, even though it is obsolete. Obsolete changesets with
 non-obsolete descendants are not hidden.
 
@@ -425,7 +425,7 @@
 .. figure:: figures/figure-ug07.svg
 
    Figure 7: evolve your repository (``hg evolve --all``) to take care
-   of instability. Unstable changesets become obsolete, and are
+   of instability. Orphan changesets become obsolete, and are
    replaced by successors just like the amended changeset was.
 
 Example 8: Prune an older changeset
@@ -441,19 +441,19 @@
 
   $ hg prune 19
   1 changesets pruned
-  1 new unstable changesets
+  1 new orphan changesets
 
 As above, this leaves your repository in a funny intermediate state:
 revision 20 is the non-obsolete descendant of obsolete revision 19.
-That is, revision 20 is unstable.
+That is, revision 20 is an orphan.
 
 .. figure:: figures/figure-ug08.svg
 
    Figure 8: ``hg prune`` marks a changeset obsolete without creating
    a successor. Just like with ``hg amend``, non-obsolete descendants
-   of the pruned changeset are now unstable.
+   of the pruned changeset are now orphans.
 
-As before, the solution to unstable changesets is to evolve your
+As before, the solution to orphan changesets is to evolve your
 repository::
 
   $ hg evolve --all
@@ -485,11 +485,11 @@
   $ hg update 22
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg uncommit file2.c
-  1 new unstable changesets
+  1 new orphan changesets
   $ hg status
   M file2.c
 
-Now your repository has unstable changesets, so you need to evolve it.
+Now your repository has orphan changesets, so you need to evolve it.
 However, ``hg evolve`` requires a clean working directory to resolve merge
 conflicts, so you need to decide what to do with ``file2.c``.
 
@@ -530,7 +530,7 @@
   $ hg update -q 26
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg uncommit -q file2.c  # obsoletes rev 26, creates rev 28
-  1 new unstable changesets
+  1 new orphan changesets
   $ hg status
   M file2.c
 
@@ -541,7 +541,7 @@
 Figure 11 shows the story so far: ``uncommit`` obsoleted revision 26
 and created revision 28, the successor of 26. Then we committed
 revision 29, a child of 28. We still have to deal with the revision 27,
-which is an unstable changeset.
+which is an orphan changeset.
 
 .. figure:: figures/figure-ug11.svg
 
@@ -549,7 +549,7 @@
    separately will soon result in a two-headed repository.
 
 This is where things get tricky. As usual when a repository has
-unstable changesets, we want to evolve it::
+orphan changesets, we want to evolve it::
 
   $ hg evolve --all
 
@@ -561,7 +561,7 @@
 
 .. figure:: figures/figure-ug12.svg
 
-   Figure 12: ``evolve`` takes care of unstable changesets; it does
+   Figure 12: ``evolve`` takes care of orphan changesets; it does
    not solve all the world's problems.
 
 As usual when faced with a two-headed repository, you can either merge
@@ -594,7 +594,7 @@
 change in the future. Consider the history in Figure 12, where revision 27
 is obsolete and the child of 26, also obsolete. If we ``hg touch 27``, that
 creates a new revision which is a non-obsolete child of 26—i.e., it is an
-unstable. It's also *divergent*, another type of trouble that we'll learn
+orphan. It's also *divergent*, another type of trouble that we'll learn
 about in the `next section`_.
 
 .. _`next section`: sharing.html